JP2010169149A - Disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily secure a mounting space for a return spring while preventing the drag of a friction pad and the occurrence of braking noises. <P>SOLUTION: The return spring 18 on the inner side is formed as an integrated structure consisting of a fixed part 18A, a first extension part 18B, a second extension part 18C and a friction detection part 18E by bending a metal plate 19. The first extension part 18B is raised up to be apart from the side of the fixed part 18A to the axial outside of a disc 1, and oriented so that the direction of its plate thickness is the approximately radial direction of the disc 1. The second extension part 18C is formed by turning the first extension part 18B at its front end side back into an approximate V- or U-shape, and provided extending obliquely toward the side of a bent piece portion 17A of an abutting plate part 17. A protruded portion 18D provided at the front end side of the second extension part 18C is put in contact with the surface of the abutting plate part 17 in an approximate point-contact state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a disc brake suitably used for applying a braking force to a vehicle such as an automobile.

  In general, a disc brake provided in a vehicle such as an automobile has a pair of arms spaced apart in the rotational direction of the disc and straddling the outer peripheral side of the disc in the axial direction, and an attachment member attached to a non-rotating portion of the vehicle, A caliper that is slidably provided on each arm of the mounting member, and a pair of friction pads that are slidably supported on each arm of the mounting member via pad springs and pressed against both sides of the disk by the caliper And so on.

  This type of disc brake according to the prior art is such that when a vehicle driver or the like performs a brake operation, a piston provided on the inner side of the caliper is slid to the disc side by supplying hydraulic pressure from the outside, and the inner side Press the friction pad against the disc. Then, the caliper slides and displaces with respect to the mounting member by the reaction force at this time, and presses the friction pads between the outer leg portion and the piston on both sides of the disc, thereby applying a braking force to the rotating disc. Is given.

  In this case, each arm portion of the mounting member is provided with a pad guide for guiding the pair of friction pads so as to be slidable in the axial direction of the disk. Further, a pad spring for elastically supporting the pair of friction pads between the arm portions is attached to each arm portion of the mounting member, and the friction pad is attached to the pad guide of each arm portion. It has a function to suppress the backlash and smooth the sliding displacement of the friction pad.

  The friction pads extend in the rotational direction or the circumferential direction of the disc, and are provided with convex ears (fitting portions) that are slidably fitted to the pad guides of the mounting member on both ends thereof. And a lining made of a friction material provided on the surface side of the back metal.

  Further, there is known one provided with a return spring that urges each of the friction pads in a direction in which the friction pads are separated from both sides of the disk when the brake operation of the vehicle is released. The return spring is provided between the mounting member and the friction pad and biases the friction pad in a return direction away from the disk (see, for example, Patent Document 1).

  The return spring is fixedly attached at a base end side thereof to a position corresponding to the ear portion of the back metal of the friction pad, and a distal end side thereof elastically contacts the attachment member via the pad spring. Thus, the friction pad is constantly biased toward the return position that is on the outer side in the axial direction of the disk.

JP 2002-327780 A

  By the way, in the above-mentioned prior art, the base end side of the return spring is fixed and attached to the base side of the protruding ear part of the back metal of the friction pad, and the pad guide of the attachment member is attached to the tip side of the return spring. It arrange | positions so that it may straddle in the circumferential direction of a disk, and it is set as the structure contact | abutted (elastic contact) to the arm part side of an attachment member via a pad spring.

  However, since the return spring employed in the prior art has a configuration in which the plate thickness direction is oriented in the circumferential direction of the disk, for example, when the caliper is a twin bore, and / or when the wear detection unit is attached to the return spring, etc. In addition, the mounting space in the layout may be reduced, and it may be difficult to dispose a return spring between the mounting member and the friction pad.

  In the case of the return spring according to the prior art, when the brake operation of the vehicle is released and the friction pad is urged in the return direction away from the disk, the friction pad is inclined obliquely with respect to the disk surface. May behave. As a result, there is a problem that uneven wear occurs in the friction pad, dragging of the friction pad, and brake squeal occur.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to easily secure a mounting space for the return spring, to return the friction pad in a stable posture, and to friction. An object of the present invention is to provide a disc brake capable of reducing uneven wear of the pad and preventing pad dragging, brake squealing, and the like.

  In order to solve the above-described problems, the present invention provides a mounting member having a pair of arm portions that are spaced apart in the rotational direction of the disc and straddle the outer peripheral side of the disc in the axial direction, and a pad guide is provided on each arm portion. A caliper provided slidably on the attachment member, and a pair of friction pads slidably attached to the respective arm portions of the attachment member via the pad guide and pressed against both sides of the disk by the caliper And a return spring provided between the friction pad and the mounting member and biasing the friction pad in a return direction away from the disk, and the friction pad extends in the circumferential direction of the disk and has both ends thereof The present invention is applied to a disc brake including a back metal provided with a fitting portion slidably fitted to the pad guide of the mounting member on the side and a lining provided on the surface side of the back metal.

  According to the first aspect of the present invention, the return spring made of the metal plate has a first end that is fixed to a back metal of the friction pad and a front end that extends in a direction away from the disk. An extension portion, and a second extension portion that is folded back from the distal end side of the first extension portion toward the attachment member side and extends to a position that elastically contacts the attachment member side. The first extending portion is configured to be oriented so that the plate thickness direction is substantially the radial direction of the disk.

  On the other hand, according to the invention of claim 2, the friction pad extends in the circumferential direction of the disk, and a back metal provided with ears slidably attached to the pad guides of the attachment member on both ends thereof, In a disc brake comprising a lining provided on the surface side of the back metal, the return spring made of a metal plate has a proximal end side fixed to the ear portion of the back metal and a distal end side extending in a direction away from the disk. A first extending portion whose plate thickness direction is oriented substantially in the radial direction of the disk, and is folded back from the tip end side of the first extending portion toward the mounting member side and elastically contacts the mounting member side. A second extending portion extending to a position, and a distal end side of the second extending portion is located on the inner side in the radial direction of the disk with respect to the ear portion of the back metal. From the first extending portion so as to abut on the side Toward the rotation direction of the disk are configured to be extended.

  According to a third aspect of the present invention, there is provided an attachment member having a pad guide formed with a portion that is spaced apart in the rotational direction of the disc and straddles the outer peripheral side of the disc in the axial direction, and is slidably provided on the attachment member Provided between the friction pad and the mounting member, and a pair of friction pads that are slidably mounted on the mounting member via the pad guide and pressed against both sides of the disk by the caliper. And a return spring made of a metal plate that urges the friction pad away from the disk in a return direction, and the friction pad extends in the circumferential direction of the disk and is slidably fitted to a pad guide of the mounting member. The present invention is applied to a disc brake composed of a back metal provided with a fitting portion and a lining provided on the surface side of the back metal.

  A feature of the configuration adopted by the invention of claim 3 is that the return spring made of the metal plate has a fixing portion fixed to the back metal of the friction pad, and the plate thickness direction is substantially the radial direction of the disc. An extension portion that is bent with respect to the fixing portion, extends in a direction away from the disk, and has a distal end folded back toward the attachment member side and elastically abutting against the attachment member side, and the extension portion A wear detecting portion that is integrally formed with the fixed portion at a position away from the wear pad and detects whether or not the lining of the friction pad is worn, and is configured to be formed as an integrated object by bending the metal plate. .

  According to a fourth aspect of the present invention, a projecting protrusion that protrudes toward the attachment member is formed by drawing on the distal end side of the second extending portion.

  Further, according to the invention of claim 5, the protrusion is formed in a convex shape that is circular or elliptical so as to be in line contact with the mounting member side.

  As described above, according to the first aspect of the present invention, the return spring made of the metal plate has the first extending portion whose base end side is fixed to the back metal of the friction pad and the front end side extends in a direction away from the disk; A second extending portion that is folded back from the front end side of the first extending portion toward the mounting member side and extends to a position that elastically contacts the mounting member side, and the first extending portion Since the portion is oriented so that the plate thickness direction is substantially the radial direction of the disk, a space for attaching the return spring can be easily secured between the back metal of the friction pad and the mounting member side. This makes it possible to mount the return spring using a small mounting space, and to increase the degree of freedom in layout design.

  Moreover, the return spring having the first extension portion and the second extension portion can apply the biasing force of the return spring to the friction pad at an appropriate position, for example, when the brake operation of the vehicle is released. The friction pad can be stably returned while maintaining the posture parallel to the disk surface. Accordingly, the friction pad can be smoothly returned to the standby position by the biasing force of the return spring when the brake operation is released, and the return operation of the friction pad can be stabilized. As a result, uneven wear and the like of the friction pad can be reduced, and pad dragging, brake noise, and the like can be prevented.

  In the second aspect of the invention, the second extending portion formed by folding the tip end side of the first extending portion can be extended along the rotation direction of the disk, for example, toward the arm portion side of the mounting member. Therefore, the extension length (extension length) of the first extension portion and the second extension portion can be formed longer than that of the conventional product, thereby facilitating adjustment of the spring constant. , Can increase the degree of design freedom. Further, the yield in manufacturing the return spring can be improved, and the necessary strength can be easily ensured.

  Further, in the invention of claim 3, since the wear detection part is formed integrally with the return spring, for example, an erroneous assembly or the like occurs compared to a case where the wear detection part or the like is formed separately from the return spring. Can be eliminated, the number of parts can be reduced, and workability during assembly can be improved.

It is a top view which shows the disc brake by embodiment of this invention. It is the front view which looked at the disc brake of Drawing 1 from the outer side. It is the rear view which looked at the disc brake of FIG. 1 from the inner side. It is a front view which expands and shows the state which attached the inner side return spring to the inner side friction pad. FIG. 5 is a plan view of the inner friction pad and the inner return spring shown in FIG. 4. It is a front view which expands and shows the state which attached the outer side return spring to the outer side friction pad. FIG. 7 is a plan view of the outer friction pad and the outer return spring shown in FIG. 6. It is a front view which expands and shows the return spring in FIG. 4 as a single body. It is a top view of the return spring shown in FIG. FIG. 9 is a left side view of the return spring shown in FIG. 8. FIG. 9 is a right side view of the return spring shown in FIG. 8. It is a bottom view of the return spring shown in FIG. It is a perspective view which shows the return spring of an inner side. It is a perspective view which shows the return spring of an outer side. It is a front view which shows the metal plate which molds a return spring raw material. It is a front view which shows the shape | molded return spring raw material. It is a front view which expands and shows the inner side return spring by a modification as a single unit.

  Hereinafter, a disc brake according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  Here, FIG. 1 to FIG. 16 show an embodiment of the present invention. In the figure, reference numeral 1 denotes a rotating disk. The disk 1 rotates in the direction of arrow A in FIG. 1 together with wheels (not shown) when the vehicle travels in the forward direction, for example.

  Reference numeral 2 denotes an attachment member as a carrier attached to a non-rotating portion of the vehicle. The attachment member 2 is spaced apart in the rotation direction (circumferential direction) of the disk 1 as shown in FIGS. A pair of arms 2A, 2A extending in the axial direction of the disk 1 so as to straddle and the base end side of each arm 2A are connected so as to be integrated, and at a position on the inner side of the disk 1 It is comprised from the thick support part 2B etc. which are fixed to the non-rotation part of the said vehicle.

  Further, a reinforcing beam 2C for connecting the distal ends of the arms 2A and 2A to each other at a position on the outer side of the disk 1 is integrally formed on the mounting member 2 in a bow shape as shown in FIG. Thereby, each arm part 2A, 2A of the attachment member 2 is integrally connected by the support part 2B on the inner side of the disk 1, and is integrally connected by the reinforcing beam 2C on the outer side.

  A disc path portion 3 extending in an arc shape along the outer periphery (rotation locus) of the disc 1 is formed in the middle portion of the arm portion 2A in the length direction (axial direction of the disc 1) as shown in FIG. The inner side and outer side pad guides 4 are formed on both sides of the disc path portion 3 (both sides in the axial direction of the disc 1). Each arm 2A is provided with a pin hole (not shown), and a slide pin 7 described later is slidably fitted into these pin holes.

  4, 4,... Are pad guides provided on each arm 2 </ b> A of the mounting member 2. These pad guides 4 are formed as concave grooves having a U-shaped cross section as shown in FIGS. 2 and 3. A friction pad 10 described later extends in the direction in which the friction pad 10 slides and displaces (the axial direction of the disk 1). These pad guides 4 are positioned on both sides in the axial direction of the disk path portion 3, and are located on the proximal end side (inner side) and the distal end side (outer side) of each arm portion 2 </ b> A across the disk path portion 3. Each is arranged.

  Here, the pad guide 4 is formed as a U-shaped groove so as to sandwich an ear portion 11A of a friction pad 10 described later from above and below (in the radial direction of the disk 1). Along with the springs 15 and 16, it has a function of guiding the disc 1 so as to be slidable in the axial direction.

  5, 5,... Are torque receiving portions provided on the respective arm portions 2A of the mounting member 2 and located on the inner side in the radial direction of the disc 1 with respect to the pad guides 4. These torque receiving portions 5 are shown in FIG. As shown in FIG. 3, it is formed as a flat receiving surface portion extending substantially inwardly in the radial direction of the disk 1 with respect to the lower wall surface of the pad guide 4 and the like. These torque receiving portions 5 are also located on both sides in the axial direction of the disc path portion 3 (both sides of the disc 1), like the pad guides 4, and the proximal end side (inner side) and the distal end side of each arm portion 2A. (Outer side) respectively.

  Here, among each torque receiving portion 5, the torque receiving portion 5 located on the rotational direction exit side (hereinafter referred to as the “return side”) of the disk 1 rotating in the direction of arrow A is a friction pad 10 which will be described later when the brake is operated. The braking torque received from the disk 1 is received via the flat surface portion 11D of the back metal 11 and a hanging plate portion 16B of the pad spring 16 described later. In addition, the torque receiving portion 5 located on the rotation direction entrance side (hereinafter referred to as the “turn-in side”) of the disk 1 rotating in the direction indicated by the arrow A is moved from the flat surface portion 11D of the friction pad 10 to a pad spring 15 described later. It is placed in a slightly separated state via the hanging plate portion 15B.

  A caliper 6 is slidably provided on the mounting member 2. The caliper 6 includes an inner leg 6A provided on one side (inner side) of the disk 1 as shown in FIG. A bridge portion 6B extending from the inner leg portion 6A to the other side (outer side) of the disc 1 so as to straddle the outer peripheral side of the disc 1 between the arm portions 2A, and a distal end side (outer side) of the bridge portion 6B The outer leg portion 6 </ b> C extends inward in the radial direction of the disk 1 and has a plurality of claw portions on the front end side.

  The inner leg 6A of the caliper 6 is formed with two cylinders (both not shown) made of, for example, twin bores into which two pistons are slidably fitted. Further, the inner leg portion 6A is provided with a pair of attachment portions 6D and 6D that protrude in the left and right directions in FIGS. 1 and 3, and these attachment portions 6D are formed on the caliper 6 as a sliding pin described later. 7, each arm portion 2 </ b> A of the attachment member 2 is slidably supported via 7.

  Reference numerals 7 and 7 denote sliding pins as support members for slidably supporting the caliper 6 on the mounting member 2, and these sliding pins 7 are respectively provided with bolts 8 on the mounting portions 6D of the caliper 6 as shown in FIG. The distal end side of the mounting member 2 extends into each arm 2A (the pin hole). And the front end side of each sliding pin 7 is slidably inserted in each arm part 2A (pin hole) of the attachment member 2, and the caliper 6 is attached to the attachment member 2 via these sliding pins 7. Are slidably supported by each arm 2A.

  Reference numerals 9 and 9 denote protective boots for protecting the sliding pins 7 from the outside. The protective boots 9 are formed as bellows-like tubes using an elastic resin material or the like, and both ends of the protective boots 9 slide with the arm portions 2A. It is attached to the moving pin 7. The protective boot 9 covers the periphery of the base end side of the sliding pin 7 and prevents rainwater or the like from entering between the sliding pin 7 and the pin hole of the arm portion 2A.

  Reference numerals 10 and 10 denote inner side and outer side friction pads arranged to face both sides of the disk 1, and these friction pads 10 are arranged in the circumferential direction (rotation direction) of the disk 1 as shown in FIGS. And a lining 12 (see FIGS. 5 and 7) as a friction material that is fixedly attached to the surface of the back metal 11 and frictionally contacts the surface of the disk 1. . The back metal 11 of the friction pad 10 is provided with ears 11A, 11A as fitting portions in a convex shape on both ends in the length direction (circumferential direction of the disk 1).

  Here, each ear | edge part 11A of the back metal 11 is each slidably inserted in each pad guide 4 of the attachment member 2 via each guide plate part 15A, 16A of the pad springs 15 and 16 mentioned later. . The inner and outer friction pads 10 are pressed against both sides of the disk 1 by the caliper 6 during brake operation. At this time, each ear 11A of the back metal 11 extends along the pad guide 4 in the axial direction of the disk 1. It slides and displaces.

  Further, the back metal 11 of the friction pad 10 is formed of a flat plate material having a fan shape as a whole as shown in FIGS. 4 and 6, and each of the outer peripheral side outer diameter portion 11 </ b> B and the inner peripheral side inner diameter extends in an arc shape. 11C. Further, on both sides in the length direction of the back metal 11 (the inflow side and the outflow side of the disc 1), a flat surface portion 11D extending substantially radially inward with respect to the protruding direction of each ear portion 11A and extending inward in the radial direction of the disc 1. 11D are formed, and left and right inclined surface portions 11E and 11E are formed between the flat surface portion 11D and the inner diameter portion 11C.

  Then, pad biasing portions 15C and 16C of pad springs 15 and 16 described later elastically contact the inclined surface portions 11E and 11E of the friction pad 10 (back metal 11). It is always urged in the directions indicated by arrows B and B in FIG. 3 (in a direction perpendicular to the inclined surface portion 11E and obliquely toward the radially outer side and the inner circumferential side of the disk 1).

  Further, the back metal 11 of the friction pad 10 is provided with left and right caulking portions 11F and 11F that are located closer to the base end (root) side of each ear portion 11A. Of the respective crimping portions 11F, the crimping portion 11F positioned on the side of the disk 1 is subjected to crimping in order to fix return springs 18 and 18 'to be described later to the back metal 11 of the friction pad 10. Is.

  On the other hand, of the flat surface portions 11D of the friction pad 10 (back metal 11), the flat surface portion 11D located on the unwinding side of the disk 1 is, for example, a braking torque (in FIG. 1) that the friction pad 10 receives from the disk 1 when the vehicle is braked. The rotation torque in the direction indicated by arrow A) continues to abut the arm portion 2A (torque receiving portion 5) of the mounting member 2 via the hanging plate portion 16B of the pad spring 16, and between the abutment surfaces Thus, the braking torque at the time of brake operation is received by the mounting member 2.

  In addition, the outer friction pad 10 shown in FIG. 2 is provided with a squeal preventing shim plate 13 on the back side of the back metal 11 in a detachable manner. Further, the inner friction pad 10 shown in FIG. 3 is provided with a shim plate 14 for preventing noise from being detachably provided on the back side of the back metal 11.

  Reference numeral 15 denotes a pad spring on the turn-in side disposed on the turn-in side of the disk 1, and the pad spring 15 is attached to the arm part 2A located on the turn-in side among the arm parts 2A of the mounting member 2, and will be described later. The inner side and outer side friction pads 10 are elastically supported between the rotating pad springs 16 and the sliding displacement of these friction pads 10 is made smooth. Then, the pad spring 15 on the turn-in side is formed by bending (press forming) a metal plate having a spring property (for example, a stainless steel plate) as shown in FIGS. 17 and a single unit.

  Here, the pad spring 15 is formed by bending in a substantially U-shape so as to be fitted in each pad guide 4 of the mounting member 2, and a pair of guides separated from each other on the inner side and the outer side of the disk 1. An inner side that extends downward between each flat surface portion 11D of the friction pad 10 (back metal 11) and the torque receiving portion 5 from the lower end side (the inner side in the radial direction of the disk 1) of each of the guide plate portions 15A. And the outer-side drooping plate portion 15B and the lower end of the drooping plate portion 15B (the radially inner portion of the disc 1) bent in a substantially L-shape or S-shape toward the rotation direction or circumferential inner side of the disc 1. The inner side and outer side pad urging portions 15C are formed.

  Each guide plate portion 15A of the pad spring 15 is fitted and mounted in each pad guide 4 of the mounting member 2 as shown in FIGS. 2 and 3, and the back metal 11 of the friction pad 10 is attached to the convex ear. It has a function of guiding in the axial direction of the disk 1 through the portion 11A. Further, each pad urging portion 15C of the pad spring 15 is elastically brought into contact with each inclined surface portion 11E of the back metal 11 from the left and right sides, so that the back metal 11 of the friction pad 10 is moved in the direction indicated by the arrow B (for example, a disc 1 in an oblique direction between the radially outer side and the rotational direction or the inner side in the circumferential direction).

  Reference numeral 16 denotes a delivery-side pad spring disposed on the delivery side of the disk 1, and the pad spring 16 is attached to the arm portion 2 </ b> A located on the delivery side among the arm portions 2 </ b> A of the attachment member 2. The friction pad 10 on the inner side and the outer side is elastically supported between the pad spring 15 on the turn-in side and the sliding displacement of the friction pad 10 is made smooth.

  The pad spring 16 on the delivery side is configured in substantially the same manner as the pad spring 15 on the introduction side described above, and as shown in FIGS. 2 and 3, the guide plate portion 16A on the inner side and the outer side, and the hanging plate portion. 16B, pad urging portion 16C and the like. However, they are different in that a contact plate portion 17 described later is provided only on the pad spring 15 on the turn-in side and not on the pad spring 16 on the turn-out side.

  Reference numerals 17 and 17 denote contact plate portions provided integrally with the pad spring 15 on the turn-in side, and each contact plate portion 17 has a base end side on the inner side of the pad spring 15 as shown in FIGS. 1 and the outer side guide plate 16A, and the front end is slightly spaced from the arm 2A of the mounting member 2 as illustrated in FIG. It is a free end extending obliquely in the direction of.

  2 and 3, the free end side of the contact plate portion 17 is formed in a flat plate shape wider than return springs 18 and 18 ', which will be described later, and the return springs 18 and 18' are in an elastically deformed state. It provides a receiving seating surface when abutting with. Further, as illustrated in FIG. 1, a bent piece portion 17A bent in an L shape toward the outer side in the axial direction of the disk 1 is provided on the tip side of the contact plate portion 17, and the bent piece portion 17A. The projections 18D and 18D ′ of the return springs 18 and 18 ′, which will be described later, are brought into contact with each other so as to be able to come into contact with and come apart from each other. The contact plate portion 17 may be configured to extend obliquely from the hanging plate portion 15B of the pad spring 15 to the outer side in the circumferential direction of the disk 1 (direction opposite to the rotation direction A).

  Reference numerals 18 and 18 ′ denote return springs that urge the inner and outer friction pads 10 in a return direction away from the disk 1. Here, the inner side return spring 18 is attached to the back metal 11 of the inner side friction pad 10 as shown in FIGS. 3 to 5, and the outer side return spring 18 'is as shown in FIGS. It is attached to the back metal 11 of the friction pad 10 on the outer side. The return springs 18 and 18 'on the inner side and the outer side differ only in that they are formed by bending the front and back surfaces of the return spring material 20 to be described later in opposite directions. (See FIGS. 15 and 16).

  That is, as shown in FIGS. 3 to 5, the inner return spring 18 includes a flat plate-like fixing portion 18 </ b> A fixed to the ear portion 11 </ b> A side of the friction pad 10 (back metal 11) by a caulking portion 11 </ b> F and the fixing portion 18 </ b> A. A first extending portion 18B formed by being bent in an L shape so as to rise vertically from the portion 18A and extending in a direction in which the front end side is vertically separated from the surface of the disk 1, and the first extending portion 18B 2nd extension extended from the front end side toward the bent piece portion 17A (arm portion 2A of the mounting member 2) side of the contact plate portion 17 and elastically contacting the contact plate portion 17 It is comprised by the installation part 18C, the below-mentioned wear detection part 18E, etc.

  Here, the first extending portion 18B of the return spring 18 is formed integrally with the fixed portion 18A at the base end side, and the direction of the plate thickness t is substantially the radial direction of the disk 1 as shown in FIGS. It is oriented in the Y-axis direction exemplified in FIG. That is, when the axis extending in the left and right directions perpendicular to the Y axis is the X axis and the direction perpendicular to both the X axis and the Y axis is the Z axis, the first extending portion 18B is , Extending so as to rise in the Z-axis direction from the fixed portion 18A, the plate width direction is the X-axis direction, and the plate thickness t is the Y-axis direction.

  In this case, the X-axis direction corresponds to the substantially circumferential direction (more precisely, the left and right directions) of the disk 1 rotating in the direction indicated by the arrow A in FIGS. This corresponds to the substantially radial direction of the disk 1, and the Z-axis direction corresponds to the axial direction of the disk 1. The fixed portion 18A of the return spring 18 is arranged in parallel with the plane formed by the X axis and the Y axis, and the plate thickness direction is oriented in the Z axis direction. A caulking hole 18A1 (see FIG. 8) into which the caulking portion 11F of the back metal 11 is inserted is formed in the center of the fixing portion 18A.

  Further, the second extending portion 18C is folded back in a substantially U shape from the tip (rising end) of the first extending portion 18B, and as described above, the bent piece portion 17A (the arm of the mounting member 2). It extends so as to be inclined in a slightly twisted state toward the part 2A) side. A convex protrusion 18D protruding toward the surface side of the contact plate 17 is formed by drawing (pressing) on the front end side of the second extending portion 18C. It is formed as a hemispherical convex part having a circular or elliptical shape so as to be in line contact with the surface of the contact plate part 17 (contact in a state almost close to point contact).

  On the other hand, the return spring 18 is integrally formed with a wear detector 18E for detecting whether or not the lining 12 of the friction pad 10 is worn. Here, as shown in FIGS. 8 to 13, the return spring 18 is L-shaped so as to rise vertically from the fixed portion 18 </ b> A at a position spaced from the first extending portion 18 </ b> B in the X-axis and Y-axis directions. A bent piece portion 18F formed in a Z direction extending in the Z direction, the tip side of which is perpendicularly spaced from the surface of the disk 1, and the tip side of the bent piece portion 18F in two steps in a substantially U shape or L shape. A folded portion 18G formed by folding back is integrally provided.

  The wear detector 18E is integrally connected to the bent piece 18F via the folded portion 18G, and is parallel to the bent piece 18F with a small gap in the X-axis direction (reverse in the Z-axis direction). Direction). In this case, the wear detection portion 18E and the bent piece portion 18F are arranged in a positional relationship that is substantially perpendicular to the first extending portion 18B, and is substantially parallel to a plane formed by the Y axis and the Z axis. It extends. In addition, the tip side of the wear detecting portion 18E protrudes in the Z-axis direction by a predetermined dimension from the position of the fixed portion 18A.

  As a result, the wear detector 18E protrudes from the surface of the back plate 11 in the thickness direction (Z-axis direction) of the lining 12 with the return spring 18 assembled to the back plate 11 of the friction pad 10 as shown in FIG. To do. When the lining 12 is greatly worn and becomes thinner than a specified thickness, the tip of the wear detector 18E comes into direct contact with the disk 1 to generate a so-called wear detection sound.

  For this reason, the wear detecting portion 18E and the bent piece portion 18F have the plate thickness direction oriented in the X-axis direction (substantially circumferential direction of the disc 1), for example, the disc 1 rotating in the direction indicated by the arrow A in FIG. When the tip of the wear detecting portion 18E comes into contact with the outer surface, it elastically deforms in the same direction. Reinforcing ribs 18H are formed on the wear detecting portion 18E and the bent piece portion 18F, respectively, using means such as embossing.

  Here, the return spring 18 is molded from a metal plate 19 having a spring property such as a stainless steel plate (see FIG. 15) using means such as press molding, whereby a large number of return spring materials 20 are formed. The The return spring material 20 has a fixed portion 20A, a first extending portion 20B, a second extending portion 20C, a protruding portion 20D, a wear detecting portion 20E, a bent piece portion 20F, and a turned portion 20G. .

  Then, the fixing portion 20A, the first extending portion 20B, the second extending portion 20C, the protruding portion 20D, the wear detecting portion 20E, the folded piece portion 20F, and the folded portion 20G of the return spring material 20 are pressed (bending, As shown in FIGS. 8 to 13, the return spring 18 on the inner side is drawn into a fixed portion 18A, a first extending portion 18B, a second extending portion 18C, a protruding portion 18D, and a wear detecting portion 18E. The folded piece portion 18F and the folded portion 18G are formed as a single body.

  Further, as shown in FIG. 14, the outer side return spring 18 ′ is bent in the opposite direction from the inner side return spring 18 when bending the return spring material 20, as shown in FIG. The fixed portion 18A ′ having 18A1 ′, the first extending portion 18B ′, the second extending portion 18C ′, the protruding portion 18D ′, the wear detecting portion 18E ′, the bent piece portion 18F ′, and the folded portion 18G ′ are integrated. It is formed as a product.

  Further, the fixing portions 18A and 18A ′ which are the base end sides of the return springs 18 and 18 ′ are arranged on the side where the disk 1 is turned in with respect to the inner and outer friction pads 10 as shown in FIGS. Is fixed to the ear 11A of the back metal 11 located in the vicinity of or in the vicinity of the ear 11A via the caulking part 11F. The second extending portions 18C and 18C 'of the return springs 18 and 18' are located between the pad guide 4 and the torque receiving portion 5 located on the side of the disk 1 as shown in FIGS. It is disposed at a position straddling the contact plate portion 17 of the pad spring 15 and extends along the rotation direction of the disk 1 (actually the direction opposite to the arrow A direction).

  Further, the first extending portions 18B and 18B ′ of the return springs 18 and 18 ′ are raised from the fixing portions 18A and 18A ′ (the back surface of the back metal 11) toward the outside of the disk 1 in the axial direction. The direction of the plate thickness t (see, for example, FIG. 8) is oriented so as to be the Y-axis direction (substantially the radial direction of the disk 1). The second extending portions 18C and 18C ′ are formed by folding back the leading ends (rising ends) of the first extending portions 18B and 18B ′ into a substantially V shape or U shape, and the contact plate portion 17. It is extended so that it may incline toward the bending piece part 17A (arm part 2A of the attachment member 2), and inclines in a slightly twisted state.

  Further, substantially hemispherical projections 18D and 18D ′ projecting toward the surface side of the contact plate portion 17 are provided on the distal ends of the second extending portions 18C and 18C ′, and the projections 18D and 18D. ′ Is configured to be in line contact with the surface of the abutting plate portion 17 in a state almost close to point contact. The return springs 18, 18 ′ contact the friction pad 10 (back metal 11) with the disc 1 by causing the hemispherical projections 18 D, 18 D ′ to contact or slide in contact with the surface of the contact plate 17 in an elastically deformed state. For example, when the brake operation of the vehicle is released, the friction pad 10 is stably returned toward the initial position (standby position).

  The disc brake according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, at the time of brake operation of the vehicle, the brake fluid pressure is supplied to the inner leg portion 6A (cylinder) of the caliper 6 to cause the piston to slide and displace toward the disk 1, thereby causing the friction pad 10 on the inner side to move to the disk 1. Press on one side. At this time, since the caliper 6 receives a pressing reaction force from the disk 1, the entire caliper 6 is slid and displaced toward the inner side with respect to the arm portion 2A of the mounting member 2, and the outer leg portion 6C is a friction pad on the outer side. 10 is pressed against the other side of the disk 1.

  As a result, the inner and outer friction pads 10 can firmly hold the disk 1 rotating in the direction of arrow A in FIGS. 1 to 3 from both sides in the axial direction. 1 can be given a braking force. When the brake operation is released, the hydraulic pressure supply to the piston is stopped, so that the inner and outer friction pads 10 are separated from the disk 1 and return to the non-braking state again.

  Further, at the time of such brake operation and release (during non-braking), the back metal 11 of the friction pad 10 has the left and right inclined surface portions 11E and 11E formed by the pad urging portions 15C and 16C of the pad springs 15 and 16, respectively. 2 and FIG. 3, each ear 11 </ b> A of the back metal 11 is biased to the upper wall surface of the pad guide 4 of the arm 2 </ b> A of the mounting member 2. It is pressed so as to be in sliding contact with the guide plate portions 15A and 16A.

  For this reason, the friction of the friction pad 10 in the radial direction, the rotational direction or the circumferential direction of the disk 1 due to vibration or the like when the vehicle travels is the elasticity of the pad urging portions 15C and 16C provided in the pad springs 15 and 16. It can be regulated by force (biasing force). When the brake is operated, the friction pad 10 receives a braking torque (rotational torque in the direction of arrow A) received from the disk 1. At this time, the flat surface portion 11 </ b> D on the delivery side receives the pad spring 16 on the torque receiving portion 5 of the mounting member 2. Therefore, the braking torque at the time of brake operation can be received by the arm portion 2A (torque receiving portion 5) on the delivery side.

  Further, at the time of a brake operation, each ear portion 11A of the friction pad 10 can be held in a state of being in sliding contact with the upper wall surface of the pad guide 4 via the guide plate portions 15A, 16A of the pad springs 15, 16. The inner and outer friction pads 10 can be smoothly guided in the axial direction of the disc 1 along the guide plate portions 15A and 16A.

  Here, in this embodiment, the return spring 18 on the inner side is bent by the metal plate 19 from the fixing portion 18A, the first extending portion 18B, the second extending portion 18C, the wear detecting portion 18E, and the like. The first extending portion 18B is formed as an integral part, and is raised from the fixed portion 18A (the back surface of the back metal 11) toward the Z axis away from the disk 1 in the axial direction. The orientation is such that the direction (see FIG. 8) is the Y-axis direction (substantially the radial direction of the disk 1).

  The second extending portion 18C is formed by folding the tip (rising end) side of the first extending portion 18B into a substantially V shape or U shape, and the bent piece portion 17A ( The mounting member 2 extends obliquely toward the arm 2A) side so as to be inclined in a slightly twisted state. Further, a substantially hemispherical projection 18D that protrudes toward the surface side of the contact plate 17 is provided on the distal end side of the second extending portion 18C, and the projection 18D is provided on the surface of the contact plate 17. On the other hand, it is set as the structure which carries out a line contact in the state near a point contact.

  Therefore, the inner return spring 18 separates the friction pad 10 (back metal 11) from the disk 1 by the hemispherical protrusion 18 </ b> D contacting or slidingly contacting the surface of the contact plate 17 in an elastically deformed state. For example, when the brake operation of the vehicle is released, the friction pad 10 can be stably returned toward the initial position (standby position). The outer side return spring 18 ′ is the same as the inner side return spring 18.

  By the way, in the case of the return spring employed in the prior art, the plate thickness direction (for example, a portion corresponding to the first extending portion 18B) is generally configured to be oriented in the circumferential direction of the disk. For this reason, for example, when the caliper is a twin bore, or when the wear detection part is attached to the return spring, the mounting space on the layout is reduced, and the return spring is disposed between the mounting member and the friction pad. Can be difficult to do.

  On the other hand, in the present embodiment, as described above, the first extending portion 18B of the return spring 18 is raised in a direction away from the fixed portion 18A toward the outer side in the axial direction of the disk 1, and its thickness t (FIG. 8) is oriented in the Y-axis direction (substantially the radial direction of the disk 1). Therefore, the second extending portion 18C formed by folding the tip end side of the first extending portion 18B is inclined obliquely along the rotation direction of the disk 1 toward the bent piece portion 17A side of the contact plate portion 17. A substantially hemispherical protrusion 18D that makes line contact with the surface of the abutting plate 17 in a state close to point contact is provided on the distal end side of the second extending portion 18C. It becomes possible.

  As a result, a space for attaching the return spring 18 can be easily secured between the ear portion 11A of the friction pad 10 (back metal 11) and the arm portion 2A side of the attachment member 2, and a small attachment space is utilized. Thus, the return spring 18 can be mounted, and the degree of freedom in layout design can be increased.

  Further, the second extending portion 18C formed by folding the front end side of the first extending portion 18B can be extended along the rotation direction of the disk 1 toward the bent piece portion 17A side of the contact plate portion 17. Therefore, the extension length (extension length) of the first extension portion 18B and the second extension portion 18C can be formed longer than that of the conventional product, thereby adjusting the spring constant. It becomes easy and the freedom degree of design can be raised. Further, the yield in manufacturing the return spring 18 can be improved, and the necessary strength can be easily ensured.

  In addition, a protrusion 18D that protrudes toward the front surface side of the contact plate 17 is formed on the distal end side of the second extending portion 18C by drawing (pressing). It is possible to make contact with the surface of the contact plate portion 17 in a state close to a point contact, and the contact and sliding of the return spring 18 (projection portion 18D) with respect to the contact plate portion 17 are made smooth so that both wear, Damage can be reduced over time.

  Moreover, since the wear detecting portion 18E can be formed integrally with the return spring 18, it is possible to eliminate the occurrence of erroneous assembly as compared with the case where the wear detecting portion or the like is formed separately. The number of points can be reduced and workability during assembly can be improved. The same effect as that of the inner return spring 18 can be obtained with respect to the outer return spring 18 '.

  Therefore, according to the present embodiment, even when the caliper 6 is a twin bore or when the wear detection portions 18E and 18E ′ are attached to the return springs 18 and 18 ′, the ear portion 11A of the friction pad 10 (back metal 11). And a space for mounting the return springs 18 and 18 'between the mounting member 2 and the arm 2A side can be easily secured, and the degree of freedom in layout design can be increased.

  Further, when the brake operation is released, the friction pad 10 can be returned to the standby position while maintaining the posture parallel to the disk surface by the urging force of the return springs 18, 18 ′. It can be stabilized. As a result, uneven wear or the like of the friction pad 10 can be reduced, and pad dragging or brake noise can be prevented.

  Further, in the present embodiment, taking the inner return spring 18 as an example, the fixing portion 18A is fixed to the back metal 11 of the friction pad 10 via the caulking portion 11F, and on the tip side of the second extending portion 18C. Since the provided protrusion 18D is elastically brought into contact with the mounting member 2 via the contact plate portion 17 of the pad spring 15, the return spring 18 is assembled in advance to the back metal 11 of the friction pad 10. For example, as compared with the case where the return spring is fixed to the mounting member 2 (or the contact plate portion 17 of the pad spring 15), the workability at the time of assembly can be improved, and the return spring 18 The urging force can be stably applied to the friction pad 10.

  In addition, since the protrusion 18D is formed as a hemispherical convex portion that is circular or elliptical so as to be in line contact with the surface of the contact plate portion 17, the protrusion 18D is formed on the surface of the contact plate portion 17. Can be smoothly contacted. For example, even when the projecting portion 18D of the return spring 18 slides along the surface of the contact plate portion 17 to a position where it hits the bent piece portion 17A during the braking operation of the vehicle, the bent piece portion 17A causes the return spring 18 to move. The protrusion 18D can be positioned so as to prevent it from being pulled out, and the urging force in the return direction by the return spring 18 can be stably applied to the friction pad 10.

  In addition, since the protrusion 18D provided on the distal end side of the second extending portion 18C is in sliding contact with the surface of the flat contact plate 17, the protrusion 18D of the return spring 18 is in contact with the contact plate. It is possible to prevent wear and damage due to sliding displacement with respect to 17 over a long period of time, extend the durability and life of the return spring 18, and improve the reliability. The same effect as that of the inner return spring 18 can be obtained with respect to the outer return spring 18 '.

  In the above-described embodiment, the protrusions 18D and 18D ′ of the return springs 18 and 18 ′ (the tip side of the second extending portions 18C and 18C ′) are elastic with respect to the contact plate 17 of the pad spring 15. The case where it is brought into contact with is described as an example. However, the present invention is not limited to this. For example, a contact plate portion formed by a member different from the pad spring is fixed to the mounting member, and the return springs 18, 18 ′ are attached to the contact plate portion. It is good also as a structure which contact | abuts protrusion part 18D, 18D 'grade | etc.,. Further, without using the contact plate portion 17 or the like, the protrusion of the return spring (the distal end side of the second extending portion) is used as the end surface of the attachment member (or the contact surface for the return spring formed on the attachment member) or the like. It is good also as a structure made to contact | abut directly.

  In the embodiment, the first extending portion 18B extends in the axial direction (Z-axis direction) of the disc 1 from a position closer to the inner side in the radial direction of the disc 1 than the fixed portion 18A of the return spring 18. Explained with an example. However, the present invention is not limited to this. For example, as in the modification shown in FIG. 17, a total of 2 from the radially inner position and the radially outer position of the disk 1 with respect to the fixing portion 21A of the return spring 21. The first extending portions 21B and 21B of the book may be provided so as to extend in the Z-axis direction, and the second extending portions 21C and 21C may be provided on the distal end side.

  In this case, the fixing portion 21A, the first extending portion 21B, the second extending portion 21C, the protruding portion 21D, the wear detecting portion 21E, the bent piece portion 21F, and the folded portion 21G of the return spring 21 are the return spring 18 described above. The configuration is almost the same. However, in the return spring 21, the two second extending portions 21 </ b> C can be formed to expand in a “C” shape, and the tip-side protruding portion 21 </ b> D is brought into contact with the mounting member side at two locations. A stable pad posture can be secured. Further, the outer side return spring 18 'can be modified in the same manner as in the modification shown in FIG.

  In the above-described embodiment, the case where the wear detecting portion 18E and the like are integrally formed with the return spring 18 has been described as an example. However, the present invention is not limited to this. For example, the wear detecting portion 18E, the bent piece portion 18F, and the folded portion 18G are formed separately from the return spring 18, and are necessary using, for example, caulking, welding, or the like. Accordingly, the two may be connected to each other. The same change can be made for the return spring 18 'on the outer side.

  On the other hand, in the said embodiment, the pad guide 4 made concave shape is formed in the arm portion 2A of the attachment member 2, and the case where the ear portion 11A that becomes the fitting portion of the back metal 11 is formed in a convex shape will be described as an example. did. However, the present invention is not limited to this. For example, a concave fitting portion may be provided on the back metal of the friction pad, and a convex pad guide may be provided on the arm portion of the attachment member.

  Further, in the above embodiment, when the proximal ends of the return springs 18 and 18 ′ are caulked and fixed to the ear portion 11 </ b> A located on the side of the disk 1 in the left and right ear portions 11 </ b> A of the back metal 11. Was described as an example. However, the present invention is not limited to this. For example, a return spring may be similarly provided on the delivery side of the disk 1.

  In the above embodiment, the so-called integrated pad spring 15 having the guide plate portions 15A, the hanging plate portions 15B, and the pad biasing portions 15C on the inner side and the outer side of the disc 1 is used as an example. I gave it as an explanation. However, the present invention is not limited to this. For example, two pad springs having a shape in which the pad spring 15 is separated from the inner side and the outer side of the disc 1 are arranged on the inner side and the outer side of the disc 1, respectively. It is good also as a structure to install. This also applies to the pad spring 16 located on the unwinding side of the disk 1.

  Next, effects of the inventions of claims 4 and 5 will be described. According to a fourth aspect of the present invention, since the protruding portion that protrudes toward the mounting member side is formed by drawing on the distal end side of the second extending portion, the protruding portion is formed on the mounting member side. It can be made to contact smoothly, and both wear and damage can be reduced over a long period of time.

  Further, according to the invention of claim 5, since the protrusion is formed as a convex part having a circular shape or an ellipse so as to be in line contact with the attachment member side, the attachment member can be obtained by using such a protrusion. The contact and sliding of the return spring (protrusion) with respect to the side can be made smooth, and both wear and damage can be suppressed over a long period of time.

DESCRIPTION OF SYMBOLS 1 Disc 2 Mounting member 2A Arm part 3 Disc pass part 4 Pad guide 5 Torque receiving part 6 Caliper 7 Sliding pin 10 Friction pad 11 Back metal 11A Ear part (fitting part)
11F Caulking part 12 Lining 15, 16 Pad spring 15A, 16A Guide plate part 15B, 16B Drooping plate part 15C, 16C Pad biasing part 17 Contacting plate part 18, 18 ', 21 Return spring 18A, 18A', 21A Fixing part 18B, 18B ', 21B 1st extension 18C, 18C', 21C 2nd extension 18D, 18D ', 21D Convex protrusion 18E, 18E', 21E Wear detection part 18F, 18F ', 21F Bending One part 18G, 18G ', 21G Folding part 19 Metal plate 20 Return spring material

Claims (5)

A mounting member having a pair of arm portions spaced apart in the rotational direction of the disc and straddling the outer peripheral side of the disc in the axial direction, and a pad guide provided on each arm portion, and slidably provided on the mounting member A caliper, a pair of friction pads slidably attached to each arm of the mounting member via the pad guide, and pressed against both sides of the disk by the caliper, and between the friction pad and the mounting member And a return spring made of a metal plate that urges the friction pad in a return direction away from the disk,
The friction pad extends in the circumferential direction of the disk, and is provided on a back metal provided with fitting portions that are slidably fitted on the pad guides of the mounting member on both ends thereof, and on the surface side of the back metal. In the disc brake consisting of
The return spring made of the metal plate includes a first extending portion whose proximal end is fixed to the back metal of the friction pad and a distal end extending in a direction away from the disk, and a distal end of the first extending portion. A second extending portion that is folded back toward the mounting member side and extends to a position that elastically contacts the mounting member side;
The disc brake according to claim 1, wherein the first extending portion is oriented so that a plate thickness direction thereof is substantially the radial direction of the disc. A mounting member having a pair of arm portions spaced apart in the rotational direction of the disc and straddling the outer peripheral side of the disc in the axial direction, and a pad guide provided on each arm portion, and slidably provided on the mounting member A caliper, a pair of friction pads slidably attached to each arm of the mounting member via the pad guide, and pressed against both sides of the disk by the caliper, and between the friction pad and the mounting member And a return spring made of a metal plate that urges the friction pad in a return direction away from the disk,
The friction pad extends in the circumferential direction of the disk and has a back metal provided with ears slidably attached to the pad guides of the mounting member on both ends thereof, and a lining provided on the surface side of the back metal In the disc brake consisting of
The return spring made of the metal plate has a base end side fixed to the ear portion of the back metal, a tip end side extending in a direction away from the disk, and a plate thickness direction oriented in a substantially radial direction of the disk. An extension portion, and a second extension portion that is folded back from the distal end side of the first extension portion toward the attachment member side and extends to a position that elastically contacts the attachment member side. ,
The front end side of the second extending portion is in the rotational direction of the disc from the first extending portion so as to contact the arm portion side of the mounting member at a position radially inward of the disc with respect to the ear portion of the back metal. A disc brake characterized by having a structure extending toward the front. A mounting member having a portion that is spaced apart in the rotational direction of the disk and straddles the outer peripheral side of the disk in the axial direction and has a pad guide formed thereon, a caliper provided slidably on the mounting member, and the mounting member A pair of friction pads that are slidably mounted via the pad guide and pressed against both sides of the disk by the caliper, and a return that is provided between the friction pad and the mounting member and separates the friction pad from the disk A return spring made of a metal plate biased in the direction,
The friction pad includes a back metal provided with a fitting portion extending in a circumferential direction of the disk and slidably fitted to a pad guide of the mounting member, and a lining provided on the surface side of the back metal. In the brake
The return spring made of the metal plate is formed by bending a fixing portion fixed to the back plate of the friction pad and the fixing portion so that the plate thickness direction is substantially the radial direction of the disc. An extension portion that extends in a direction to be bent and elastically abuts against the attachment member side with its distal end side folded back toward the attachment member side, and is formed integrally with the fixed portion at a position spaced from the extension portion. A disc brake comprising a wear detecting portion for detecting whether or not the lining of the pad is worn, and is formed as a single body by bending the metal plate.   3. The disc brake according to claim 2, wherein a projecting protrusion that protrudes toward the attachment member is formed by drawing on a front end side of the second extending portion.   The disc brake according to claim 4, wherein the protruding portion is formed in a convex shape that is circular or elliptical so as to be in line contact with the mounting member side.

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